Power driven wheelchair

ABSTRACT

A power driven wheelchair and a method for operating same are provided. In one embodiment, the power driven wheelchair includes a system controller with a main controller, a storage device, and at least one input device, a motor assembly, and a common bus. The motor assembly may include a drive motor, a local controller, and a sensor sensing a condition associated with the drive motor and in communication with the local controller. In another embodiment, the power driven wheelchair includes the system controller, an actuator assembly, and the common bus. The actuator assembly may include an actuator mechanism, a local controller, and a sensor sensing a condition associated with the actuator mechanism and in communication with the local controller. Multiple embodiments of the method are related to controlling various arrangements of motor assemblies or actuator assemblies.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of Ser. No. 11/513,802, filed Aug.31, 2006, titled POWER DRIVEN WHEELCHAIR, which claims the benefit ofeight U.S. provisional patent applications, including Ser. No.60/712,987, filed Aug. 31, 2005, Ser. No. 60/727,005, filed Oct. 15,2005, Ser. No. 60/726,983, filed Oct. 15, 2005, Ser. No. 60/726,666,filed Oct. 15, 2005, Ser. No. 60/726,981, filed Oct. 15, 2005, Ser. No.60/726,993, filed Oct. 15, 2005, Ser. No. 60/727,249, filed Oct. 15,2005, and Ser. No. 60/727,250, filed Oct. 15, 2005. This application isalso related to seven co-pending U.S. utility patent applications filedthe same day as this application, including Ser. No. 11/513,740, filedAug. 31, 2006 entitled “Mode Programmable Actuator Controller for PowerPositioning Seat or Leg Support of a Wheelchair,” Ser. No. 11/514,016,filed Aug. 31, 2006 entitled “Method and Apparatus for Setting orModifying Programmable Parameter in Power Driven Wheelchair,” Ser. No.11/513,854, filed Aug. 31, 2006 entitled “Context-Sensitive Help forDisplay Device Associated with Power Driven Wheelchair,” Ser. No.11/511,606, filed Aug. 29, 2006 entitled “Method and Apparatus forProgramming Parameters of a Power Driven Wheelchair for a Plurality ofDrive Settings,” Ser. No. 11/513,780, filed Aug. 31, 2006 entitled“Adjustable Mount for Controller of Power Driven Wheelchair,” Ser. No.11/513,746, filed Aug. 31, 2006 entitled “Method and Apparatus forAutomated Positioning of User Support Surfaces in Power DrivenWheelchair,” and Ser. No. 11/513,750, filed Aug. 31, 2006 entitled“Method and Apparatus for Improved Support of Power Driven Wheelchair.”The contents of all above-identified patent application(s) and patent(s)are fully incorporated herein by reference.

BACKGROUND

Power driven wheelchairs generally include right and left drive wheelsdriven by a motor controller via corresponding right and left drivemotors. A power driven wheelchair may also include actuators, motors, orother devices to control user support surfaces, such as seats, backs,leg rests, foot rests, or head rests. These various actuators, motors,and other devices are typically controlled via a user interface. Theuser interface may include input devices, such as a joystick,pushbuttons and other types of switches, potentiometers, and other typesof control devices, and output devices, such as a graphic display,alphanumeric display, or indicators. Input devices for special needsusers, such as a proportional head control, a sip n' puff system, afiber optic tray array, a proximity head array, or a proximity switcharray, may also be provided as a user interface or as a remote input tothe user interface.

Examples of power driven wheelchairs are provided in a product brochureentitled “Invacare® Storm® Series TDX™ Power Wheelchairs, includingFormula™ Powered Seating,” Form No. 03-018, 2004 from InvacareCorporation of Elyria, Ohio, the contents of which are fullyincorporated herein by reference. Additional examples of power drivenwheelchairs are provided in another product brochure entitled “Invacare®Tarsys® Series Powered Seating System,” Form No. 00-313, 2002 fromInvacare Corporation, the contents of which are fully incorporatedherein by reference.

Currently, a separate remote programmer unit may be used to set ormodify programmable parameters associated with operation and support ofa given power driven wheelchair. Examples of remote programmers andtheir use in conjunction with a power driven wheelchair are provided inU.S. Pat. No. 6,871,122 to Wakefield, II and U.S. Pat. No. 6,819,981 toWakefield, II et al., both assigned to Invacare Corporation. Thecontents of both of these patents are fully incorporated herein byreference.

SUMMARY

In one aspect, a power driven wheelchair is provided. In one embodiment,the power driven wheelchair includes: a system controller including amain controller, a storage device in operative communication with themain controller, and at least one input device in operativecommunication with the main controller and a first motor assembly inoperative communication with the system controller via a common bus, thefirst motor assembly including a first drive motor, a first localcontroller in operative communication with the first drive motor, and afirst sensor sensing a condition associated with the first drive motorand in operative communication with the first local controller.

In another embodiment, in place of the first motor assembly, the powerdriven wheelchair includes: a first actuator assembly in operativecommunication with the system controller via a common bus, the firstactuator assembly including a first actuator mechanism, a first localcontroller in operative communication with the first actuator mechanism,and a first sensor sensing a condition associated with the firstactuator mechanism and in operative communication with the first localcontroller.

In another aspect, a method of operating a power driven wheelchair isprovided. In one embodiment, the method includes: a) activating an inputdevice associated with a system controller, b) selecting one or moreoperating parameters from a plurality of programmable operatingparameters based at least in part on the input device activation, c)transmitting at least one of the selected operating parameters from thesystem controller to a first motor assembly in a first message via acommon bus, the first motor assembly including a first drive motor, afirst local controller in operative communication with the first drivemotor, and a first sensor sensing a condition associated with the firstdrive motor and in operative communication with the first localcontroller, and d) controlling the first drive motor via the first localcontroller in response to operating parameters received by the firstmotor assembly and in relation to the condition sensed by the firstsensor.

In another embodiment, the method includes: a) and b) as stated abovealong with c) transmitting at least one of the selected operatingparameters from the system controller to a first actuator assembly in afirst message via a common bus, the first actuator assembly including afirst actuator mechanism, a first local controller in operativecommunication with the first actuator mechanism, and a first sensorsensing a condition associated with the first actuator mechanism and inoperative communication with the first local controller and d)controlling the first actuator mechanism via the first local controllerin response to operating parameters received by the first actuatorassembly and in relation to the condition sensed by the first sensor.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the presentinvention will become better understood with regard to the accompanyingdrawings, following description, and appended claims.

FIG. 1 shows an exemplary embodiment of a power driven wheelchair.

FIG. 2 is a block diagram of an exemplary embodiment of a power drivenwheelchair.

FIG. 3 is a block diagram of another exemplary embodiment of a powerdriven wheelchair.

FIG. 4 is a block diagram showing pertinent portions of the exemplaryembodiment of the power driven wheelchair of FIG. 2 in communicationwith an exemplary embodiment of a programmer.

FIG. 5 is a block diagram showing pertinent portions of the exemplaryembodiment of the power driven wheelchair of FIG. 3 in communicationwith the exemplary embodiment of the programmer of FIG. 4.

FIG. 6 is a block diagram of yet another exemplary embodiment of a powerdriven wheelchair.

FIG. 7 shows exemplary embodiments of intelligent actuators in a rearview of a power driven wheelchair.

FIGS. 8 through 11 are perspective views of exemplary embodiments of asystem controller for a power driven wheelchair.

FIG. 12 is a perspective view of an exemplary embodiment of a programmerfor a system controller of a power driven wheelchair.

FIG. 13 is a perspective view of an exemplary embodiment of bus cablingfor a power driven wheelchair.

FIG. 14 is a perspective view of an exemplary embodiment of anintelligent proportional attendant control for a power drivenwheelchair.

FIG. 15 is a perspective view of an exemplary embodiment of a portablestorage medium for a power driven wheelchair.

FIG. 16 is a hierarchical diagram of an exemplary embodiment of normaloperations for a power driven wheelchair.

FIG. 17 is a hierarchical diagram of an exemplary embodiment of supportoperations for a power driven wheelchair.

FIG. 18 is a perspective view of an exemplary embodiment of a powerdriven wheelchair with a powered seat shown in a tilt position.

FIG. 19 is a flow chart of an exemplary embodiment of a process forcontrolling a power driven wheelchair.

FIG. 20 is a flow chart of another exemplary embodiment of a process forcontrolling a power driven wheelchair.

FIG. 21, in conjunction with FIG. 20, is a flow chart of yet anotherexemplary embodiment of a process for controlling a power drivenwheelchair.

DETAILED DESCRIPTION

The following paragraphs include definitions of exemplary terms usedwithin this disclosure. Except where noted otherwise, variants of allterms, including singular forms, plural forms, and other affixed forms,fall within each exemplary term meaning. Except where noted otherwise,capitalized and non-capitalized forms of all terms fall within eachmeaning.

“Circuit,” as used herein includes, but is not limited to, hardware,firmware, software or combinations of each to perform a function(s) oran action(s). For example, based on a desired feature or need, a circuitmay include a software controlled microprocessor, discrete logic such asan application specific integrated circuit (ASIC), or other programmedlogic device. A circuit may also be fully embodied as software. As usedherein, “circuit” is considered synonymous with “logic.”

“Comprising,” “containing,” “having,” and “including,” as used herein,except where noted otherwise, are synonymous and open-ended. In otherwords, usage of any of these terms (or variants thereof) does notexclude one or more additional elements or method steps from being addedin combination with one or more enumerated elements or method steps.

“Controller,” as used herein includes, but is not limited to, anycircuit or device that coordinates and controls the operation of one ormore input or output devices. For example, a controller can include adevice having one or more processors, microprocessors, or centralprocessing units (CPUs) capable of being programmed to perform input oroutput functions.

“Logic,” as used herein includes, but is not limited to, hardware,firmware, software or combinations of each to perform a function(s) oran action(s), or to cause a function or action from another component.For example, based on a desired application or need, logic may include asoftware controlled microprocessor, discrete logic such as anapplication specific integrated circuit (ASIC), or other programmedlogic device. Logic may also be fully embodied as software. As usedherein, “logic” is considered synonymous with “circuit.”

“Measurement,” as used herein includes, but is not limited to, anextent, magnitude, size, capacity, amount, dimension, characteristic orquantity ascertained by measuring. Example measurements are provided,but such examples are not intended to limit the scope of measurementsthe systems and methods described herein can employ.

“Operative communication,” as used herein includes, but is not limitedto, a communicative relationship between devices, logic, or circuits,including mechanical and pneumatic relationships. Direct electrical,electromagnetic, and optical connections and indirect electrical,electromagnetic, and optical connections are examples of suchcommunications. Linkages, gears, chains, push rods, cams, keys,attaching hardware, and other components facilitating mechanicalconnections are also examples of such communications. Pneumatic devicesand interconnecting pneumatic tubing may also contribute to operativecommunications. Two devices are in operative communication if an actionfrom one causes an effect in the other, regardless of whether the actionis modified by some other device. For example, two devices separated byone or more of the following: i) amplifiers, ii) filters, iii)transformers, iv) optical isolators, v) digital or analog buffers, vi)analog integrators, vii) other electronic circuitry, viii) fiber optictransceivers, ix) Bluetooth communications links, x) 802.11communications links, xi) satellite communication links, and xii) otherwireless communication links. As another example, an electromagneticsensor is in operative communication with a signal if it receiveselectromagnetic radiation from the signal. As a final example, twodevices not directly connected to each other, but both capable ofinterfacing with a third device, e.g., a central processing unit (CPU),are in operative communication.

“Or,” as used herein, except where noted otherwise, is inclusive, ratherthan exclusive. In other words, “or’ is used to describe a list ofalternative things in which one may choose one option or any combinationof alternative options. For example, “A or B” means “A or B or both” and“A, B, or C” means “A, B, or C, in any combination.” If “or” is used toindicate an exclusive choice of alternatives or if there is anylimitation on combinations of alternatives, the list of alternativesspecifically indicates that choices are exclusive or that certaincombinations are not included. For example, “A or B, but not both” isused to indicate use of an exclusive “or” condition. Similarly, “A, B,or C, but no combinations” and “A, B, or C, but not the combination ofA, B, and C” are examples where certain combination of alternatives arenot included in the choices associated with the list.

“Processor,” as used herein includes, but is not limited to, one or moreof virtually any number of processor systems or stand-alone processors,such as microprocessors, microcontrollers, central processing units(CPUs), and digital signal processors (DSPs), in any combination. Theprocessor may be associated with various other circuits that supportoperation of the processor, such as random access memory (RAM),read-only memory (ROM), programmable read-only memory (PROM), erasableprogrammable read-only memory (EPROM), clocks, decoders, memorycontrollers, or interrupt controllers, etc. These support circuits maybe internal or external to the processor or its associated electronicpackaging. The support circuits are in operative communication with theprocessor. The support circuits are not necessarily shown separate fromthe processor in block diagrams or other drawings.

“Signal,” as used herein includes, but is not limited to, one or moreelectrical signals, including analog or digital signals, one or morecomputer instructions, a bit or bit stream, or the like.

“Software,” as used herein includes, but is not limited to, one or morecomputer readable or executable instructions that cause a computer orother electronic device to perform functions, actions, or behave in adesired manner. The instructions may be embodied in various forms suchas routines, algorithms, modules or programs including separateapplications or code from dynamically linked libraries. Software mayalso be implemented in various forms such as a stand-alone program, afunction call, a servlet, an applet, instructions stored in a memory,part of an operating system or other type of executable instructions. Itwill be appreciated by one of ordinary skill in the art that the form ofsoftware is dependent on, for example, requirements of a desiredapplication, the environment it runs on, or the desires of adesigner/programmer or the like.

With reference to FIG. 1, an exemplary embodiment of a power drivenwheelchair 10 may include a system controller 12, an intelligentproportional attendant control 14, an intelligent compact joystick 16,and an intelligent actuator 18. Various physical and functionalcharacteristics of the power driven wheelchair 10 and other embodimentsof power driven wheelchairs described herein are disclosed in eight U.S.provisional patent applications incorporated by reference above,including Ser. Nos. 60/712,987, 60/727,005, 60/726,983, 60/726,666,60/726,981, 60/726,993, 60/727,249, and 60/727,250. Hereinafter, thisdocument may refer to these eight applications collectively as “theeight applications incorporated by reference.” Individually, theseapplications may be referred to in this document as the '987application, '005 application, '983 application, '666 application, '981application, '993 application, '249 application, and '250 application,respectively, in conjunction with the serial number assigned to thecorresponding application.

The system controller 12 and intelligent compact joystick 16 may providea person sitting in the seat of the power driven wheelchair 10 with auser interface to control operation. The intelligent proportionalattendant control 14 may provide a person, such as an attendant,positioned at the rear of the power driven wheelchair 10 with a userinterface to control operation. Various user interfaces of the powerdriven wheelchair 10 may be used to move user support surfacesassociated with powered seating to desired positions. During poweredseating operation, the system controller 12 may command the intelligentactuator 18 to move the user support surface to the desired position.The eight applications incorporated by reference describe optionalcomponents and additional embodiments for power driven wheelchairs andassociated components which also apply to the power driven wheelchair 10of FIG. 1.

With reference to FIG. 2, an exemplary embodiment of a control systemfor a power driven wheelchair 20 is depicted in block diagram fashion.As shown, the control system for the power driven wheelchair 20 mayinclude a system controller 22, an intelligent input device 24, anintelligent motor 26, a drive wheel 28, an intelligent actuator 30, auser support surface 32, a steered wheel 33, a portable storage medium34, and a common bus 35. The steered wheel 33 is optional and notrequired in power driven wheelchairs that use differential drive ofmultiple drive motors for steering.

The common bus 35 is representative of a communication bus suitable forinterfacing a plurality of components of the control system for thepower driven wheelchair 20. In various embodiments, the common bus 35may include a serial bus, a parallel bus, a communication network, orcombinations thereof. For example, the common bus 35 may include aserial bus, such as a controller area network (CAN) bus.

The system controller 22, for example, is representative of varioussystem controller models with joystick controls. The system controller22 may include a printed circuit board (PCB) assembly 36, one or moreinput devices 38, and a display 40. The one or more input devices 38,for example, may include a proportional analog joystick, a threeposition toggle or rotary switch, a return-to-center momentary threeposition switch, a rotary potentiometer, and a plurality of momentarypushbuttons. In additional embodiments, the one or more input devices38, may include other types of joysticks, switches, potentiometers,pushbuttons, or other types of control devices. The display 40, forexample, may include a 128×64 pixel graphic display or a 160×160 pixelgraphic display. In additional embodiments, the display may include agraphic display in a different size or a different arrangement ofpixels, an alphanumeric display, or another type of display. Moreover,the display 40 may include one or more indicators, such as lightemitting diodes (LEDs), lamps, other types of visual indicators, oraudible devices.

The PCB assembly 36 may include a main controller 42, a bus interface44, an on-board storage device 46, and a storage medium interface 48.The main controller 42, for example, may include a microcontroller, acentral processing unit (CPU), or another type of controller suitablefor main control of the control system for the power driven wheelchair20. For example, in one embodiment, the main controller 42 may includean SAF-XC164CS 16-bit single-chip microcontroller by InfineonTechnologies of München, Germany. The bus interface 44 makes the systemcontroller 22 compatible with messages communicated via the common bus35. For example, the system controller 22 may send messages to otherdevices connected to the common bus 35 via the bus interface 44 and mayreceive messages from such devices. Messages, for example, may includecommands, desired operating parameters, status information, or acombination thereof.

The on-board storage device 46 may include a volatile storage device,such as random access memory (RAM), and a non-volatile storage device,such as non-volatile memory, a fixed disk device, a removable discdevice, an optical storage device, etc. Non-volatile memory, forexample, may include read-only memory (ROM), programmable read-onlymemory (PROM), erasable programmable read only memory (EPROM)electrically erasable programmable read only memory (EEPROM), or flashmemory. For example, software programs, one or more programmableparameter set, and help information may be stored in one or morenon-volatile memory storage devices associated with the on-board storagedevice 46. Each programmable parameter set may include a plurality ofprogrammable operating parameters for operation of the power drivenwheelchair. The main controller 42 may run the software programs and maycontrol the display 40 and various devices connected to the common bus35 based, at least in part, on one or more of the programmable operatingparameters.

The portable storage medium 34 may include a plurality of storagelocations which may store a security key 78, one or more libraryparameter sets 80, a help file 82, advanced diagnostics information 84,and one or more software version 86. The portable storage medium 34described herein may be an optional accessory or special tool fordealers or technicians. In some cases, the portable storage medium 34may also be used in conjunction with normal operation of the powerdriven wheelchair by its owner or end user. The portable storage medium34 described herein may be suitable for use on various models andconfigurations of power driven wheelchairs. However, in another schemefor protection and security of the information stored therein, a givenportable storage medium 34 may be serialized or otherwise tailored andkeyed to an individual system controller 22 and corresponding powerdriven wheelchair. Communication between the main controller 42 and theportable storage medium 34 is via the storage medium interface 48.

The portable storage medium 34 may include a non-volatile storagemedium, such as non-volatile memory. In one embodiment, the portablestorage medium 34 may include, for example, a type of removable storagemedium known as a removable memory card. For example, the portablestorage medium 34 may include a secure digital (SD) card. In theembodiment being described, the storage medium interface 48 may include,for example, a corresponding removable memory interface (e.g., an SDcard reader) to communicate and exchange information with the maincontroller 42.

In additional embodiments, the portable storage medium 48 may includeother types of removable memory, such as a compact flash (CF) card, aflash memory pen drive, a memory stick, a microdrive, a multimediamemory card (MMC), a smart media (SM) card, an xD picture card, asubscriber identity module (SIM) card, a memory chip (e.g., ROM, PROM,EPROM, EEPROM), or another suitable form of removable, separable, ordetachable memory. In other additional embodiments, the portable storagemedium may include other forms of removable storage medium, such asoptical discs (e.g., compact discs (CDs), digital video discs (DVDs)) orfloppy disks (e.g., zip disks).

In still further embodiments, the portable storage medium 48 may includea portable storage device, such as an external memory card reader, anexternal optical disc drive, an external floppy disk drive, a portablecomputer (e.g., laptops, notebooks, personal digital assistants (PDAs)),a mobile telephone (e.g., cellular telephone, personal communicationsystem, satellite telephone), a digital camera, an MP3 player, or anytype of portable storage device capable of wired or wirelesscommunication with another compatible communication device.

The storage medium interface 48, for example, includes a connector orsocket that mates with the portable storage medium 34 and an electroniccircuit that supports communication between the main controller 42 andthe portable storage medium 34. For example, the storage mediuminterface 48 may include a memory card reader, a memory chip socket, anoptical disc drive, a floppy disk drive, a serial port (e.g., universalserial bus (USB) port, RS-232), a parallel port (e.g., small computersystem interface (SCSI) port), a modem, an Ethernet port, a wirelessEthernet transceiver (e.g., IEEE 802.11b), a Bluetooth transceiver, aninfrared (IR) transceiver, a radio frequency (RF) transceiver, a mobiletelephone interface, a cable television interface, a satellitetelevision interface, or any communication device capable of wired orwireless communication with a corresponding portable storage medium.

The intelligent input device 24, for example, is representative of aremote input device that works in conjunction with the system controller22. The control system for the power driven wheelchair 20 may includemultiple intelligent input devices 24. The intelligent input device 24may include a PCB assembly 50 and one or more input devices 52. The PCBassembly 50 and one or more input devices 52 may be packaged within acommon enclosure or may be otherwise assembled to form the intelligentinput device 24. The one or more input devices 52 have the samecharacteristics as described above for the one or more input devices 38of the system controller 22. The PCB assembly 50 may include a localcontroller 54 and a bus interface 56. The local controller 54 may detectactivations of the one or more input devices 52, construct one or moremessages based at least in part on such activations, and communicatesuch messages, for example, to the system controller 22 via the businterface 56. The bus interface 56 generally has the characteristicsdescribed above for the bus interface 44 of the system controller 22.

The intelligent motor 26 and drive wheel 28, for example, are exemplaryof one or more intelligent motors 26 and one or more drive wheels 28.The power driven wheelchair may include various configurations ofintelligent motors 26 and drive wheels 28. The power driven wheelchairmay also include various configurations of castor wheels or steeredwheels 33 in conjunction with a particular configuration of intelligentmotors 26 and drive wheels 28. Overall, the power driven wheelchair mayinclude three or more wheels, including at least one drive wheel.Otherwise, the wheels may be the same type or a suitable combination ofvarious types. If the power driven wheelchair includes two drive wheelsthat are independently drive, steering may be accomplished throughdifferential speed and direction of the drive wheels and a steered wheelis not required.

For example, in one embodiment, the power driven wheelchair may includeleft and right intelligent motors 26, each mechanically linked tocorresponding left and right drive wheels 28. This embodiment may alsoinclude one or more castor wheels. In one arrangement, the left andright drive wheels 28 may be toward the rear of the power drivenwheelchair and two castor wheels may be toward the front. In anotherarrangement, the left and right drive wheels 28 may be toward thecenter, two castor wheels may be toward the rear, and two additionalcastor wheels may be toward the front. In still another arrangement, theleft and right drive wheels 28 may be toward the front and two castorwheels may be toward the rear. Steering in configurations withindependently-controlled left and right drive wheels 28 may beaccomplished by differential control of corresponding intelligent motors26 with respect to different speed, direction, or combinations thereof.

In another embodiment, the power driven wheelchair may include oneintelligent motor 26 mechanically linked to one or more drive wheels 28.This embodiment may also include one or more steered wheels 33.Additionally, this configuration may also include one or more castorwheels. In one arrangement, two drive wheels 28 may be toward the rearof the power driven wheelchair and two steered wheels 33 may be towardthe front. In another arrangement, the two drive wheels 28 may be towardthe front and the two steered wheels 33 may be toward the rear. Thesteered wheels 33 may be controlled independently or in tandem via asuitable mechanical linkage. Steering the power driven wheelchair may beaccomplished by controlling an actuator mechanism to adjust an angularposition of the steered wheel(s) relative to a vertical axis. Forexample, in configurations with a single intelligent motor 26, steeringmay be accomplished by controlling an actuator mechanism to adjust anangular position of one or more steered wheels relative to a verticalaxis. Control of the actuator mechanism for steering being separate anddistinct from control of the intelligent motor 26.

In still another embodiment, the power driven wheelchair may includethree or more intelligent motors 26, each mechanically linked tocorresponding drive wheels 28. This embodiment may also include one ormore castor wheels.

In the various configurations of the power driven wheelchair andarrangements of components described above, a drive wheel 28 may also besteered through various control schemes. In other words, it isenvisioned that the drive wheel 28 and the steered wheel 33 may actuallyrefer to the same wheel through proper arrangement of components andimplementation of control schemes. For additional information oncontrolling steering in this manner and in other configurations of thepower driven wheelchair described above, see U.S. Pat. No. 5,547,038 toMadwed. The contents of the Madwed patent document is fully incorporatedherein by reference.

The intelligent motor 26 may include a PCB assembly 58, a drive motor60, and one or more sensors 62. The PCB assembly 58, drive motor 60, andone or more sensors 62 may be packaged within a common enclosure or maybe otherwise assembled to form the intelligent motor 26. The PCBassembly 58 may include a local controller 64 and a bus interface 66.The bus interface 66 generally has the same characteristics describedabove for the bus interface 44 of the system controller 22. The businterface 66 may receive messages, for example, from the systemcontroller 22. Messages received from the system controller 22, forexample, may include commands, desired operating parameters, or acombination thereof. For example, certain commands or desired operatingparameters in messages to the intelligent motor 26 may identify desireddirection, desired speed, desired acceleration, or a desired operatingprofile. The local controller 64 may provide local closed-loop controlof the drive motor 60 in conjunction with commands or operatingparameters from the system controller 22 and feedback from the one ormore sensors 62. The local controller 64 may provide status informationin messages to the system controller 22 in conjunction with, forexample, achievement of desired operating parameters.

The drive motor 60, for example, may include a 2-pole motor, a 4-polemotor, a 4-pole motor with feedback, or a gearless brushless motor. Thedrive motor 60 may also include a permanent magnet motor, a brushlessmotor, a shunt-wound field motor, a series-wound field motor, or acompound-wound field motor. Additionally, the drive motor 60 may includea direct current (DC) motor, an alternating current (AC) motor, a3-phase motor, a multi-phase motor, or a reversible motor. A specifictype of motor may have characteristics associated with a combination ofthese various types of motors. For example, a particular DC motor mayalso be brushless, multi-phase, and reversible and may include permanentmagnets.

The drive motor 60 may mechanically interface with the drive wheel 28directly, via a gearbox assembly, or via another suitable drive train.In another embodiment, the drive motor 60 may mechanically interfacewith multiple drive wheels 28 directly, via a gearbox assembly, or viaanother suitable drive train. The power driven wheelchair may includemultiple intelligent motors 26. Any combination of multiple intelligentmotors 26 may be combined in the power driven wheelchair. For example, afirst intelligent motor 26 may mechanically interface with one drivewheel 28 and a second intelligent motor 26 may mechanically interfacewith two or more drive wheels 28.

The one or more sensors 62 may include any combination of various typesof sensors suitable for measuring or detecting characteristics of thedrive motor 60 to provide feedback of actual conditions for comparisonto desired conditions associated with the commands or operatingparameters. For example, motor voltage, current, speed, or accelerationmay be monitored. The polarity of the sensed signal, for example, may bemonitored to detect direction.

The intelligent actuator 30 may include various types of actuatormechanisms, such as a stepper motor, a linear motor, a servo-motor, oranother suitable device associated with position control. The powerdriven wheelchair may include multiple intelligent actuators 30.Moreover, in addition to controlling user support surfaces, intelligentactuators 30 may also be used to control other aspects of the powerdriven wheelchair, such as steered wheels 33, ventilator trays, etc.

The intelligent actuator 30 may include a PCB assembly 68, an actuatormechanism 70, and one or more sensors 72. The PCB assembly 68, actuatormechanism 70, and one or more sensors 72 may be packaged within a commonenclosure or may be otherwise assembled to form the intelligent actuator30. The PCB assembly 68 may include a local controller 74 and a businterface 76. The bus interface 76 generally has the characteristicsdescribed above for the bus interface 44 of the system controller 22.The bus interface 76 may receive messages, for example, from the systemcontroller 22. The messages, for example, may include commands, desiredoperating parameters, or a combination thereof. For example, certaincommands or desired operating parameters in messages to the intelligentactuator 30 may identify desired position, desired speed, desiredacceleration, or a desired operating profile. The local controller 74may provide local closed-loop control of the actuator mechanism 70 inconjunction with commands or operating parameters from the systemcontroller 22 and feedback from the one or more sensors 72. The localcontroller 74 may provide status information in messages to the systemcontroller 22 in conjunction with, for example, achievement of desiredoperating parameters.

The actuator mechanism 70, for example, may include a stepper motor, alinear motor, a servo motor, or another suitable device associated withposition control. The actuator mechanism 70, for example, maymechanically interface with the user support surface 32 or the steeredwheel 33 via a suitable linkage, drive train, coupling, or anothersuitable arrangement of components enabling positional movement of thedesired component in response to positional movement of the actuatormechanism 70. In another embodiment, the actuator mechanism 70 maymechanically interface with multiple user support surfaces 32 ormultiple steered wheels 33. The user support surfaces 32 may beassociated with a powered seat or a powered front rigging in the powerdriven wheelchair.

The user support surfaces 32 associated with the powered seat mayinclude a seat support, a back support, and an articulating ventilatortray. The powered seat may be adjusted in a tilt position by moving theseat and back supports. This may provide pressure relief to the user.The powered seat may also be adjusted in a recline position by movingthe back support. This may make it easier for the user to breath. Thepowered seat may be adjusted in a horizontal position by moving the seatand back supports. This may improve stability of the power drivenwheelchair by positioning the user in relation to a desired center ofgravity. The position of the ventilator tray may be adjusted in relationto a tilt or recline position, for example, to improve stability ofbreathing gas equipment positioned on the tray.

The user support surfaces 32 may also be associated with a powered frontrigging that can include a common (i.e., left and right) leg rest and acommon (i.e., left and right) foot rest. In this embodiment, the poweredfront rigging may be adjusted by pivoting the common leg rest to changethe position of the user's lower legs in relation to the thighs. Thismay provide pressure relief to the user. The powered front rigging mayalso be adjusted by raising or lowering the common foot rest. This maymake it easier for the user to transfer to or from the power drivenwheelchair.

In another embodiment, the powered front rigging may include a right legrest, a left leg rest, a right foot rest, and a left foot rest. In thisembodiment, the powered front rigging may be adjusted by pivoting theright leg rest to change the position of the user's right lower leg inrelation to the right thigh. This may provide pressure relief to theuser. The powered front rigging may also be adjusted by pivoting theleft leg rest to change the position of the user's left lower leg inrelation to the left thigh. This may also provide pressure relief to theuser. The powered front rigging may be adjusted by raising or loweringthe right foot rest. This may make the power driven wheelchair fit theuser better during normal operation. The powered front rigging may alsobe adjusted by raising or lowering the left foot rest. This may alsomake the power driven wheelchair fit the user better during normaloperation.

The one or more sensors 72 may include any combination of various typesof sensors suitable for measuring or detecting characteristics of theactuator mechanism 70 to provide feedback of actual conditions forcomparison to desired conditions associated with the commands oroperating parameters. For example, actuator position, speed, oracceleration may be monitored. The polarity of the sensed signal, forexample, may be monitored to detect direction.

The power driven wheelchair may include multiple intelligent actuators30. Any combination of multiple intelligent actuators 30 may be combinedin the power driven wheelchair. For example, a first intelligentactuator 30 may mechanically interface with the powered seat to controlthe tilt position, a second intelligent actuator 30 may mechanicallyinterface with the powered seat to control elevation, and a thirdintelligent actuator 30 may mechanically interface with one or moresteered wheels 33.

The configuration depicted in FIG. 2 can perform normal and supportoperations associated with the power driven wheelchair using the systemcontroller 22, including the various features provided under programmingmode. The '983, '005, '981, '666, and '249 applications identified andincorporated by reference above describe optional components andadditional embodiments for power driven wheelchairs and associatedcomponents which also apply to the power driven wheelchair andassociated components of FIG. 2. The various aspects of FIG. 2 describedabove may be implemented through hardware, software, firmware, orcombinations thereof.

With reference to FIG. 3, an exemplary embodiment of a control systemfor a power driven wheelchair 20′ is depicted in block diagram fashion.As shown, the control system for the power driven wheelchair 20′ mayinclude a system controller 22′, an intelligent input device 24, a drivecontroller 27, two drive wheels 28, an intelligent actuator 30′, a firstuser support surface 32′, a second user support surface 33′, a portablestorage medium 34, a common bus 35, a second bus 37, two drive motors61, and one or more sensors 63 associated with each drive motor 61. Theintelligent input device 24, two drive wheels 28, portable storagemedium 34, and common bus 35 have the same characteristics as describedabove for the control system for the power driven wheelchair 20 of FIG.2. The first user support surface 32′ and second user support surface33′ generally have the characteristics described above for the usersupport surface 32 of FIG. 2. The two drive motors 61 both generallyhave the characteristics described above for the drive motor 60 of FIG.2. The one or more sensors 63 generally have the characteristicsdescribed above for the one or more sensors 62 of FIG. 2.

With continued reference to FIG. 3, the second bus 37 is representativeof a communication bus suitable for interfacing the drive controller 27to the system controller 22′. In various embodiments, the second bus 37may include a serial bus, a parallel bus, a communication network, orcombinations thereof. For example, the second bus 37 may include a Sharkserial communication bus, developed by Dynamic Controls of New Zealand.

The system controller 22′, for example, is representative of a systemcontroller model without a joystick. This may be referred to as aDISPLAY model system controller. The system controller 22′ may include afirst PCB assembly 36′, one or more input devices 38′, a second PCBassembly 39′, and a display 40′. The one or more input devices 38′generally have the characteristics described above for the one or moreinput devices 38 of FIG. 2. The display 40′ generally has thecharacteristics described above for the display 40 of FIG. 2. The secondPCB assembly 39′ interfaces the one or more input devices 38′ to thefirst PCB assembly 36′.

The first PCB assembly 36′ may include a main controller 42′, a businterface 44′, an on-board storage device 46, and a storage mediuminterface 48. The on-board storage device 46 and storage mediuminterface 48 have the same characteristics as described above for thecontrol system for the power driven wheelchair 20 of FIG. 2. The maincontroller 42′ generally has the characteristics described above for themain controller 42 of FIG. 2. The bus interface 44′ makes the systemcontroller 22′ compatible with messages communicated via both the commonbus 35 and the second bus 37. For example, the system controller 22 maysend messages to other devices connected to the common bus 35 via thebus interface 44′ and may receive messages from such devices. Similarly,the system controller 22 may send messages to the drive controller 27via the bus interface 44′ and second bus 35 and may receive messagesfrom the drive controller 27.

The drive controller 27 is representative of a drive controller thatindependently controls two drive wheels 28 via two corresponding drivemotors 61. The power driven wheelchair may include various arrangementsof two drive wheels 28, steered wheels, and castor wheels as describedabove in conjunction with FIG. 2 for configurations with twoindependently controlled drive wheels. In other embodiments, the drivecontroller 27 may control more or less drive wheels independently or incombination via more or less drive motors.

The drive controller 27 may include a local controller 64′ and a businterface 66′. The bus interface 66′ makes the drive controller 27compatible with messages communicated via the second bus 37. The businterface 66′ may receive messages, for example, from the systemcontroller 22′. The messages, for example, may include commandsdirecting control of the local controller 64′. The local controller 64′may control the drive motors 61 in accordance with messages from thesystem controller 22′ and may, in turn, provide sensed operatingcharacteristics from the one or more sensors 63 in messages to thesystem controller 22′.

The intelligent actuator 30′ is representative of a dual intelligentactuator which, for example, controls two actuator mechanisms forpositioning two different user support surfaces, such as left and rightleg rests (e.g., 32′, 33′). The power driven wheelchair may includemultiple dual intelligent actuators 30′. Additionally, the power drivenwheelchair may include one or more single intelligent actuator 30 (FIG.2) in combination with one or more dual intelligent actuator 30′.Moreover, in addition to controlling user support surfaces, intelligentactuators 30′ may also be used to control other aspects of the powerdriven wheelchairs, such as steered wheels 33 (FIG. 2), ventilatortrays, etc.

The intelligent actuator 30′ may include a PCB assembly 68′, a firstactuator mechanism 70′, a second actuator mechanism 71, one or moresensors 72′ associated with the first actuator mechanism, and one ormore sensors 73 associated with the second actuator mechanism. The PCBassembly 68′, first and second actuator mechanisms 70′, 71, and sensors72′, 73 may be packaged within a common enclosure or may be otherwiseassembled to form the intelligent actuator 30′. The PCB assembly 68′ mayinclude a local controller 74′ and a bus interface 76. The bus interface76 generally has the characteristics described above for the businterface 44 of the system controller 22 (FIG. 2). The bus interface 76may receive messages, for example, from the system controller 22′. Themessages, for example, may include commands, desired operatingparameters, or a combination thereof. For example, certain commands ordesired operating parameters in messages to the intelligent actuator 30′may identify desired position, desired speed, desired acceleration, or adesired operating profile for the first user support surface 32′, seconduser support surface 33′, or both user support surfaces. For example,the local controller 74′ may provide local closed-loop control of thefirst actuator mechanism 70′ in conjunction with commands or operatingparameters from the system controller 22′ and feedback from the one ormore sensors 72′. Similarly, the local controller 74′ may provide localclosed-loop control of the second actuator mechanism 70′ in conjunctionwith commands or operating parameters from the system controller 22′ andfeedback from the one or more sensors 72′.

When the system controller 22′ commands both first and second actuatormechanisms 70′, 71 to be activated, the local controller 74′ mayactivate them concurrently or individually, in a coordinated fashion. Ofcourse, the system controller 22′ may command either actuator mechanism70′, 71 to be activated while the other actuator mechanism isstationary. The local controller 74′ may provide status information inmessages to the system controller 22′ in conjunction with, for example,achievement of desired operating parameters.

The actuator mechanisms 70′, 71 may include various types of actuatormechanisms, such as a stepper motor, a linear motor, a servo motor, oranother suitable device associated with position control, in anysuitable combination. Each actuator mechanism 70′, 71, for example, maymechanically interface with, for example, the corresponding user supportsurface 32′, 33′ via a suitable linkage, drive train, coupling, oranother suitable arrangement of components enabling positional movementof the desired component in response to positional movement of thecorresponding actuator mechanism 70′, 71. In another embodiment, eitheractuator mechanism 70′, 71 may mechanically interface with multiple usersupport surfaces. The user support surfaces 32′, 33′ may be associatedwith a powered seat or a powered front rigging in the power drivenwheelchair. Accordingly, the user support surface 32′, 33′ may be anysuitable combination of the various types of user support surfaces 32 inthe powered seat and powered front rigging described above for FIG. 2.

The configuration depicted in FIG. 3 can perform normal and supportoperations associated with the power driven wheelchair using the systemcontroller 22′, including the various features provided underprogramming mode. The '983, '005, '981, '666, and '249 applicationsdescribe optional components and additional embodiments for power drivenwheelchairs and associated components which also apply to the powerdriven wheelchair and associated components of FIG. 3. The variousaspects of FIG. 3 described above may be implemented through hardware,software, firmware, or combinations thereof.

With reference to FIG. 4, the block diagram depicts an exemplaryprogramming configuration for the control system for the power drivenwheelchair 20. This programming configuration may include a systemcontroller 22, a portable storage medium 34, and a programmer 88. Thesystem controller 22 and programmer 88 are connected via a cable 39.Communication between the system controller 22 and programmer 88 may beby serial or parallel bus, a network connection, or discrete wiring. Thesystem controller 22 and the portable storage medium 34 have the samecharacteristics as described above for the control system for the powerdriven wheelchair 20 of FIG. 2. However, in this configuration, theportable storage medium 34 is used in conjunction with the programmer 88instead of the controller 22.

With continued reference to FIG. 4, The programmer 88 may include afirst PCB assembly 36′, one or more input devices 38′, a second PCBassembly 39′, and a display 40′. The first PCB assembly 36′, one or moreinput devices 38′, second PCB assembly 39′, and display 40′ have thesame characteristics as described above for the system controller 22′ ofFIG. 3. In other words, the programmer 88 is similar to the DISPLAYmodel system controller of the control system for the power drivenwheelchair 20′ shown in FIG. 3.

The configuration depicted in FIG. 4 can perform support operationsassociated with the power driven wheelchair using the programmer 88,including the various features provided under programming mode. The'983, '981, and '249 applications describe optional components andadditional embodiments for power driven wheelchairs, programmers, andassociated components which also apply to the power driven wheelchair,programmer, and associated components of FIG. 4. The various aspects ofFIG. 4 described above may be implemented through hardware, software,firmware, or combinations thereof.

With reference to FIG. 5, the block diagram depicts an exemplaryprogramming configuration for the control system for the power drivenwheelchair 20′. This programming configuration may include a systemcontroller 22′, a portable storage medium 34, and a programmer 88. Thesystem controller 22′ and programmer 88 are connected via a cable 39.Communication between the system controller 22′ and programmer 88 may beby serial or parallel bus, a network connection, or discrete wiring. Theportable storage medium 34 has the same characteristics as describedabove for the control system for the power driven wheelchair 20 of FIG.2. The system controller 22′ has the same characteristics as describedabove for the control system for the power driven wheelchair 20′ of FIG.3. The programmer 88 has the same characteristics as described above forthe programming configuration shown in FIG. 4. However, in thisconfiguration, the system controller 22′ is the DISPLAY model instead ofa system controller model with a joystick.

The configuration depicted in FIG. 5 can perform support operationsassociated with the power driven wheelchair using the programmer 88,including the various features provided under programming mode. The'983, '981, and '249 applications describe optional components andadditional embodiments for power driven wheelchairs, programmers, andassociated components which also apply to the power driven wheelchair,programmer, and associated components of FIG. 5. The various aspects ofFIG. 5 described above may be implemented through hardware, software,firmware, or combinations thereof.

With reference to FIG. 6, an exemplary embodiment of a control systemfor a power driven wheelchair 100 is depicted in block diagram fashion.As shown, the control system for the power driven wheelchair 100 mayinclude a system controller 102, a drive controller 104, a right drivemotor 106, a left drive motor 108, and a suitable power source (e.g.,battery) (not shown). The right drive motor 106 may mechanicallyinterface with the right drive wheel 110. The left drive motor 108 maymechanically interface with the left drive wheel 112. Communicationbetween the system controller 102 and drive controller 104 may be via afirst communication bus 113. In various embodiments, the firstcommunication bus 113 may include a serial bus, a parallel bus, acommunication network, or combinations thereof. For example, a Sharkserial communication bus, developed by Dynamic Controls of New Zealand,may be used to communicate with the drive controller 104.

The control system for the power driven wheelchair 100 may also includea second communication bus 114 to provide communications between thesystem controller 102 and, for example, an intelligent proportionalattendant control 115, an intelligent 4-way toggle switch 116, anintelligent compact joystick 117, an intelligent tilt actuator 118, anintelligent recline actuator 119, an intelligent seat elevation actuator120, and an intelligent dual leg actuator 121. In various embodiments,the second communication bus 114 may include a serial bus, a parallelbus, a communication network, or combinations thereof. For example, thesecond communication bus 114 may include a serial bus, such as a CANbus.

The intelligent tilt actuator 118 and intelligent seat elevationactuator 120 may, for example, mechanically interface with seat and backsupport surfaces 122, 123 in an independently controlling fashion.Similarly, the intelligent dual leg actuator 121 may mechanicallyinterface with the right and left leg rest support surfaces 124, 125 inan independently controlling fashion. The intelligent recline actuator119 may, for example, mechanically interface with the back supportsurface 123 in an independently controlling fashion.

The configuration depicted in FIG. 6 can perform normal and supportoperations associated with the power driven wheelchair using the systemcontroller 102, including the various features provided underprogramming mode. The '983, '005, '981, '666, and '249 applicationsdescribe optional components and additional embodiments for power drivenwheelchairs and associated components which also apply to the powerdriven wheelchair and associated components of FIG. 6. The variousaspects of FIG. 6 described above may be implemented through hardware,software, firmware, or combinations thereof.

With reference to FIG. 7, a rear view of a power driven wheelchair showsan intelligent tilt actuator 118, an intelligent recline actuator 119,and an intelligent seat elevation actuator 120. The '983, '005, and '249applications describe optional components and additional embodiments forpower driven wheelchairs and associated components which also apply tothe power driven wheelchair and associated components of FIG. 7.

With reference to FIG. 8, an exemplary embodiment of a system controller126 may include a power/drive select switch 128, a mode select switch130, a graphic display 132, a joystick control 134, a speed control 136,and a mounting hub 138. This system controller 126 may be referred to asa multi-purpose joystick (MPJ) model. The MPJ model may also include anSD card slot (not shown) for receiving an SD card. The combination of anSD card slot and SD card is an exemplary embodiment of a storage mediuminterface 48 (FIG. 2) and portable storage medium 34 (FIG. 2). The MPJmodel provides an exemplary construction of the system controller 22(FIG. 2). Generally, the components of the MPJ model have the samefunctional characteristics as the components described above for thesystem controller 22 (FIG. 2). The '983 and '993 applications describeoptional components and additional embodiments for an MPJ model systemcontroller and associated components which also apply to the MPJ modelsystem controller and associated components of FIG. 8.

With reference to FIG. 9, another exemplary embodiment of a systemcontroller 140 may include a mode select switch 130, a graphic display132, a joystick control 134, a speed control 136, a mounting hub 138, apower/drive select switch 142, and an SD card slot 144. This systemcontroller 140 may be referred to as a personalized switch rear-mount(PSR) joystick model or simply a PSR model. The SD card slot 144 isadapted to receive an SD card. The combination of an SD card slot and SDcard is an exemplary embodiment of a storage medium interface 48 (FIG.2) and portable storage medium 34 (FIG. 2). The PSR model providesanother exemplary construction of the system controller 22 (FIG. 2).Generally, the components of the PSR model have the same functionalcharacteristics as the components described above for the systemcontroller 22 (FIG. 2). The '983 and '993 applications describe optionalcomponents and additional embodiments for a PSR model system controllerand associated components which also apply to the PSR model systemcontroller and associated components of FIG. 9.

With reference to FIG. 10, still another exemplary embodiment of asystem controller 146 may include a mode select switch 130, a graphicdisplay 132, a joystick control 134, a speed control 136, and apower/drive select switch 142. This system controller 146 may bereferred to as a personalized switch front-mount (PSF) joystick model orsimply a PSF model. A mounting hub (not shown) may also be provided onthe PSF model for mounting the system controller 146. The PSF model mayalso include an SD card slot (not shown) for receiving an SD card. Thecombination of an SD card slot and SD card is an exemplary embodiment ofa storage medium interface 48 (FIG. 2) and portable storage medium 34(FIG. 2). The PSF model provides yet another exemplary construction ofthe system controller 22 (FIG. 2). Generally, the components of the PSFmodel have the same functional characteristics as the componentsdescribed above for the system controller 22 (FIG. 2). The '983 and '993applications describe optional components and additional embodiments fora PSF model system controller and associated components which also applyto the PSF model system controller and associated components of FIG. 10.

With reference to FIG. 11, yet another exemplary embodiment of a systemcontroller 147 may include an SD card slot 144, an info switch 148, apower switch 150, a graphic display 152, an up direction switch 154, adown direction switch 156, a menu/left direction switch 158, a rightdirection switch 160, an select switch 162, and a save switch 164. Thissystem controller 147 may be referred to as a DISPLAY model. The DISPLAYmodel may also include a mounting hub (not shown) for mounting thesystem controller 147. The SD card slot 144 is adapted to receive an SDcard. The combination of an SD card slot and SD card is an exemplaryembodiment of a storage medium interface 48 (FIG. 2) and portablestorage medium 34 (FIG. 2). The DISPLAY model provides an exemplaryconstruction of the system controller 22′ (FIG. 3). Generally, thecomponents of the DISPLAY model have the same functional characteristicsas the components described above for the system controller 22′ (FIG.3). The mode select, drive select, and speed control functions describedabove for system controller models with joystick controls (FIGS. 2 and8-10), for example, may be implemented through the graphic display 152,navigational control using the up, down, menu/left, and right directionswitches 154, 156, 158, 160, and activation of the select or saveswitches 164, 166. The '983, '993, and '666 applications describeoptional components and additional embodiments for a DISPLAY modelsystem controller and associated components which also apply to theDISPLAY model system controller and associated components of FIG. 11.

With reference to FIG. 12, an exemplary embodiment of a programmer 165may include an SD card slot 144, a graphic display 152, an up directionswitch 154, a down direction switch 156, a menu/left direction switch158, a right direction switch 160, an select switch 162, a save switch164, and a power/info switch 166. The programmer 165 provides anexemplary construction of the programmer 88 (FIG. 4). Generally, thecomponents of the programmer 165 have the same functionalcharacteristics as the components identified above for the DISPLAY modelof the system controller 22′, 147 (FIGS. 3 and 11). However, theprogrammer 165 combines the power and info functions in the power/infoswitch 166. Notably, the programmer 165 does not require the speedcontrol functionality of the DISPLAY model. The programmer 165 may alsonot require other functionality of the DISPLAY model of the systemcontroller 22′, 147 (FIGS. 3 and 11) in relation to driving the powerdriven wheelchair or positioning the user support surfaces associatedwith a powered seat or a powered front rigging. The '983, '993, and '666applications describe optional components and additional embodiments fora programmer and associated components which also apply to theprogrammer and associated components of FIG. 12.

With reference to FIG. 13, an exemplary embodiment of bus cabling 167for interconnecting certain major components of a power drivenwheelchair may include cabling for a common bus 35 (FIG. 2), powerdistribution, and other control or power signals. The bus cabling 167may connect various major components of the power driven wheelchair, forexample, via a cable 168 with a stackable connector 170 on a distal endof the cable 168. The opposing end of the cable 168 may be directlywired to the corresponding component of the power driven wheelchair.Alternatively, the opposing end may include a connector that mates witha corresponding connector on the component of the power drivenwheelchair. Each stackable connector 170 may include a plurality of pins172 extending from a first side of the connector 170 and a correspondingplurality of receptacles 174 recessed into a second side of theconnector opposite from the first side. In one embodiment, the connectormay include seven pins and seven corresponding receptacles. For example,the seven pins may include two pins for the common bus 35 (FIG. 2), twopins for a second bus 37 (FIG. 3), two pins for primary power, and onepin for switched power. Of course, the stackable connectors 170 mayinclude more or less pins and the pins may carry different signals thanthose identified here.

As shown, three stackable connectors 170 may fit together in astackable, interlocking fashion. Additional stackable connectors 170 maymate with both ends of the stack of three connectors 170. A female cover176 may be used to cover the pins 172 at the bottom of the stack ofconnectors 170. Similarly, a male cover 178 may be used to cover thereceptacles 174 at the top of a stack of connectors 170. The '983application describes optional components and additional embodiments fora common bus and associated components which also apply to the stackableconnectors 170 and associated components of FIG. 13.

With reference to FIG. 14, an exemplary embodiment of an intelligentproportional attendant control 115 may include a cable 168 for buscabling 167 (FIG. 13), a joystick control 180, and a speed control 182.The '983 application describes optional components and additionalembodiments for a system controllers, remote input devices, andassociated components which also apply to the intelligent proportionalattendant control 115 and associated components of FIG. 14.

With reference to FIG. 15, a perspective view of an SD card as anexemplary embodiment of a portable storage medium 34 is provided. The'983 and '666 applications describe optional components and additionalembodiments for a portable storage medium and associated componentswhich also apply to the portable storage medium 34 of FIG. 15 andassociated components, such as a storage medium interface 48 (FIG. 2)and an SD card slot 144 (FIG. 9).

With reference to FIG. 16, a hierarchical diagram 200 of an exemplaryembodiment of normal operations 202 for a power driven wheelchair isprovided. In one embodiment, normal operations 202 may include a powereddriving mode 204 and a powered seating mode 206. The powered drivingmode 204 may be varied based on selection of a particular driveparameter set from multiple drive parameter sets. For example, the powerdriving mode 204 may include four drive parameter sets (i.e., driveparameters sets 1-4) 208. The powered seating mode 206 may includevarious operations to control movement of user support surfacesassociated with a powered seat or a powered front rigging in the powerdriven wheelchair.

The powered seating mode 206 may include an automated positioningselection 210, an automated sequential positioning selection 212, anautomated sequential positioning series selection 214, and a manualpositioning selection 216. The automated positioning 210 may include,for example, a tilt actuator selection 218, a recline actuator selection220, and a dual leg actuator selection 222. Each of the tilt actuator218, recline actuator 220, and dual leg actuator 222 selections mayinclude corresponding selections of a particular preset position frommultiple preset positions 224, 226, 228. For example, the tilt actuator204 may include four preset positions (i.e., preset positions 1-4) 224.

The automated sequential positioning 212 may include selection of aparticular preset sequence from multiple preset sequences. For example,the automated sequential positioning 212 may include four presetsequences (i.e., preset sequences 1-4) 230. Each preset sequence forautomated sequential positioning 212, for example, may include aplurality of preset positions.

The automated sequential positioning series 214 may include selection ofa particular preset series from multiple preset series. For example, theautomated sequential positioning series 214 may include four presetseries (i.e., preset series 1-4) 232. Each preset series for theautomated sequential positioning series 214, for example, may include aplurality of preset sequences. Each preset sequence in a series, forexample, may be time-spaced from a previous preset sequence. The manualpositioning 216 may include a tilt actuator selection 234, a reclineactuator selection 236, an elevation actuator selection 238, and a dualleg actuator selection 240.

The various normal operations may be implemented via menus, icons, inputdevice activations, or combinations thereof. The '983, '005, and '249applications describe optional components and additional embodiments forcertain operations regarding a power driven wheelchair and associatedmodes and processes which also apply to normal operations 202 of FIG. 16and associated modes and processes. The various aspects of FIG. 16described above may be automated, semi-automated, or manual and may beimplemented through hardware, software, firmware, or combinationsthereof.

With reference to FIG. 17, a hierarchical diagram 250 of an exemplaryembodiment of support operations 252 for a power driven wheelchair isprovided. In one embodiment, support operations may include a systemhelp 254, an advanced diagnostics 256, and a programming mode 258. Thesystem help 254 may include a context-sensitive help selection 260. Theadvanced diagnostics 256 may include, for example, a self test selection262, a diagnostics selection 264, a fault log selection 266, and acalibration selection 268.

The programming mode 258 may include a performance adjust selection 270,a download custom profiles selection 272, an upload custom profilesselection 274, and a download software version 276. The performanceadjust 270 may include selection of various items for adjustment ormodification. For example, one or more drive parameter 278 associatedwith powered driving, one or more preset position 280 associated withautomated positioning, one or more preset sequence 282 associated withautomated sequential positioning, one or more preset series 284associated with automated sequential positioning series, and a systemconfiguration 286 may be selected.

The various support operations may be implemented via menus, icons,input device activations, or combinations thereof. The '983, '005, '981,'666, and '249 applications describe optional components and additionalembodiments for certain operations regarding a power driven wheelchairand associated modes and processes which also apply to supportoperations 252 of FIG. 17 and associated modes and processes. Thevarious aspects of FIG. 17 described above may be automated,semi-automated, or manual and may be implemented through hardware,software, firmware, or combinations thereof.

With reference to FIG. 18, a perspective view of an exemplary embodimentof a power driven wheelchair after it was placed in an exemplary presettilt position 300 is provided. The '983, '005, and '249 applicationsdescribe optional components and additional embodiments for certainoperations regarding automated or manual control of user supportsurfaces in a power driven wheelchair and associated modes and processeswhich also apply to the preset reclined position 300 of FIG. 18 andassociated modes and processes.

With reference to FIG. 19, an exemplary embodiment of a process 400 forcontrolling a power driven wheelchair begins at 402 where an inputdevice associated with a system controller may be activated. At 404, oneor more operating parameters may be selected from a plurality ofprogrammable operating parameters. The selection may be based at leastin part on the input device activation. Next, at least one of theselected operating parameters may be transmitted from the systemcontroller to a first intelligent motor in a first message via a commonbus (406). The first intelligent motor may include a first drive motor,a first local controller in operative communication with the first drivemotor, and a first sensor sensing a condition associated with the firstdrive motor and in operative communication with the first localcontroller. At 408, the first drive motor may be controlled via thefirst local controller in response to operating parameters received bythe first intelligent motor and in relation to the condition sensed bythe first sensor. The first local controller may use the operatingparameters and sensed condition to control the first drive motor inclosed-loop control fashion. Again, at 410, the process has reached itsend.

In another embodiment, the process 400 may advance from 404 to 412 whereat least one of the selected operating parameters may be transmittedfrom the system controller to a second intelligent motor in a secondmessage via the common bus. The second intelligent motor may include asecond drive motor, a second local controller in operative communicationwith the second drive motor, and a second sensor sensing a conditionassociated with the second drive motor and in operative communicationwith the second local controller. At 414, the second drive motor may becontrolled via the second local controller in response to operatingparameters received by the second intelligent motor and in relation tothe condition sensed by the second sensor. The second local controllermay use the operating parameters and sensed condition to control thesecond drive motor in closed-loop control fashion. Again, at 410, theprocess has reached its end. The various aspects of FIG. 19 describedabove may be automated, semi-automated, or manual and may be implementedthrough hardware, software, firmware, or combinations thereof.

With reference to FIG. 20, another exemplary embodiment of a process 500for controlling a power driven wheelchair begins at 502 where an inputdevice associated with a system controller may be activated. At 504, oneor more operating parameters may be selected from a plurality ofprogrammable operating parameters. The selection may be based at leastin part on the input device activation. Next, at least one of theselected operating parameters may be transmitted from the systemcontroller to a first intelligent actuator in a first message via acommon bus (506). The first intelligent actuator may include a firstactuator mechanism, a first local controller in operative communicationwith the first actuator mechanism, and a first sensor sensing acondition associated with the first actuator mechanism and in operativecommunication with the first local controller. At 508, the firstactuator mechanism may be controlled via the first local controller inresponse to operating parameters received by the first intelligentactuator and in relation to the condition sensed by the first sensor.The first local controller may use the operating parameters and sensedcondition to control the first actuator mechanism in closed-loop controlfashion. At 510, the process has reached its end.

In another embodiment, the first intelligent actuator may include asecond actuator mechanism in operative communication with the firstlocal controller and a second sensor sensing a condition associated withthe second actuator mechanism and in operative communication with thefirst local controller. In this embodiment, the process 500 may advancefrom 504 to 512 where at least one of the selected operating parametersmay be transmitted from the system controller to the first intelligentactuator in a second message via the common bus. At 514, the secondactuator mechanism may be controlled via the first local controller inresponse to operating parameters received by the first intelligentactuator and in relation to the condition sensed by the second sensor.The first local controller may use the operating parameters and sensedcondition to control the second actuator mechanism in closed-loopcontrol fashion. Again, at 510, the process has reached its end. Thevarious aspects of FIG. 20 described above may be automated,semi-automated, or manual and may be implemented through hardware,software, firmware, or combinations thereof.

With reference to FIGS. 20 and 21, yet another exemplary embodiment of aprocess 550 for controlling a power driven wheelchair includes 502 and504. In this embodiment, the process 550 may advance from 504 to 556where at least one of the selected operating parameters may betransmitted from the system controller to a second intelligent actuatorin a second message via the common bus. The second intelligent actuatormay include a second actuator mechanism, a second local controller inoperative communication with the second actuator mechanism, and a secondsensor sensing a condition associated with the second actuator mechanismand in operative communication with the second local controller. At 558,the second actuator mechanism may be controlled via the second localcontroller in response to operating parameters received by the secondintelligent actuator and in relation to the condition sensed by thesecond sensor. Again, at 510, the process has reached its end for thisembodiment.

In another embodiment, the second intelligent actuator may include athird actuator mechanism in operative communication with the secondlocal controller and a third sensor sensing a condition associated withthe third actuator mechanism and in operative communication with thesecond local controller. In this embodiment, the process 550 may advancefrom 504 to 562 where at least one of the selected operating parametersmay be transmitted from the system controller to the second intelligentactuator in a third message via the common bus. At 564, the thirdactuator mechanism may be controlled via the second local controller inresponse to operating parameters received by the second intelligentactuator and in relation to the condition sensed by the third sensor.Again, for this embodiment, the process has reached its end at 510. Thevarious aspects of FIGS. 20 and 21 described above may be automated,semi-automated, or manual and may be implemented through hardware,software, firmware, or combinations thereof.

While the invention is described herein in conjunction with one or moreexemplary embodiments, it is evident that many alternatives,modifications, and variations will be apparent to those skilled in theart. Accordingly, exemplary embodiments in the preceding description areintended to be illustrative, rather than limiting, of the spirit andscope of the invention. More specifically, it is intended that theinvention embrace all alternatives, modifications, and variations of theexemplary embodiments described herein that fall within the spirit andscope of the appended claims or the equivalents thereof Any element in aclaim that does not explicitly state “means for” performing a specifiedfunction, or “step for” performing a specific function, is not to beinterpreted as a “means” or “step” clause as specified in 35 U.S.C.§112, ¶6. In particular, the use of “step of” in the claims herein isnot intended to invoke the provisions of 35 U.S.C. §112, ¶6.

The invention claimed is:
 1. A method of operating a power drivenwheelchair, including: activating an input device associated with asystem controller associated with the wheelchair; selecting one or moreoperating parameters from a plurality of programmable operatingparameters based at least in part on the input device activation;transmitting at least one of the selected operating parameters from thesystem controller to a first local controller assembly associated with afirst controllable component of the wheelchair in a first message via abus, the first local controller assembly including a first drive motoror actuator mechanism, a first local controller having circuitry todrive the first drive motor or actuator mechanism, and a first sensorsensing a condition associated with the first drive motor or actuatormechanism and in operative communication with the first localcontroller; and controlling the first drive motor or actuator mechanismvia the first local controller in response to operating parametersreceived by the first local controller assembly and in relation to thecondition sensed by the first sensor; wherein the system controller isdisposed in a first housing at a first location on the wheelchair andthe first local controller is disposed in a second housing at a secondlocation on the wheelchair.
 2. The method of claim 1, further including:transmitting at least one of the selected operating parameters from thesystem controller to a second local controller assembly associated witha second controllable component of the wheelchair in a second messagevia a bus, the second local controller assembly including a second drivemotor or actuator mechanism, a second local controller having circuitryto drive the second drive motor or actuator mechanism, and a secondsensor sensing a condition associated with the second drive motor oractuator mechanism and in operative communication with the second localcontroller; and controlling the second drive motor or actuator mechanismvia the second local controller in response to operating parametersreceived by the second local controller assembly and in relation to thecondition sensed by the second sensor; wherein the second localcontroller is disposed in a third housing at a third location on thewheelchair.
 3. The method of claim 2, further including: transmitting atleast one of the selected operating parameters from the systemcontroller to a third local controller assembly associated with a thirdcontrollable component of the wheelchair in a third message via a bus,the third local controller assembly including a third drive motor oractuator mechanism, a third local controller having circuitry to drivethe third drive motor or actuator mechanism, and a third sensor sensinga condition associated with the third drive motor or actuator mechanismand in operative communication with the third local controller; andcontrolling the third drive motor or actuator mechanism via the thirdlocal controller in response to operating parameters received by thethird local controller assembly and in relation to the condition sensedby the third sensor; wherein the third local controller is disposed in afourth housing at a fourth location on the wheelchair.
 4. The method ofclaim 3, further including: transmitting at least one of the selectedoperating parameters from the system controller to a fourth localcontroller assembly associated with a fourth controllable component ofthe wheelchair in a fourth message via a bus, the fourth localcontroller assembly including a fourth drive motor or actuatormechanism, a fourth local controller having circuitry to drive thefourth drive motor or actuator mechanism, and a fourth sensor sensing acondition associated with the fourth drive motor or actuator mechanismand in operative communication with the fourth local controller; andcontrolling the fourth drive motor or actuator mechanism via the fourthlocal controller in response to operating parameters received by thefourth local controller assembly and in relation to the condition sensedby the fourth sensor; wherein the fourth local controller is disposed ina fifth housing at a fifth location on the wheelchair.
 5. A method ofoperating a power driven wheelchair, including: activating an inputdevice associated with a system controller associated with thewheelchair; selecting one or more operating parameters from a pluralityof programmable operating parameters based at least in part on the inputdevice activation; programming at least one of the selected operatingparameters when the system controller is in a support mode; andtransmitting at least one of the selected operating parameters from thesystem controller to a first local controller assembly associated with afirst controllable component of the wheelchair in a first message via abus when the system controller is in a normal mode, the first localcontroller assembly including a first drive motor or actuator mechanism,a first local controller having circuitry to drive the first drive motoror actuator mechanism, and a first sensor sensing a condition associatedwith the first drive motor or actuator mechanism and in operativecommunication with the first local controller; and controlling the firstdrive motor or actuator mechanism via the first local controller inresponse to operating parameters received by the first local controllerassembly and in relation to the condition sensed by the first sensor;wherein the system controller is disposed in a first housing at a firstlocation on the wheelchair and the first local controller is disposed ina second housing at a second location on the wheelchair.
 6. The methodof claim 5, further including: transmitting at least one of the selectedoperating parameters from the system controller to a second localcontroller assembly associated with a second controllable component ofthe wheelchair in a second message via a bus when the system controlleris in the normal mode, the second local controller assembly including asecond drive motor or actuator mechanism, a second local controllerhaving circuitry to drive the second drive motor or actuator mechanism,and a second sensor sensing a condition associated with the second drivemotor or actuator mechanism and in operative communication with thesecond local controller; and controlling the second drive motor oractuator mechanism via the second local controller in response tooperating parameters received by the second local controller assemblyand in relation to the condition sensed by the second sensor; whereinthe second local controller is disposed in a third housing at a thirdlocation on the wheelchair.
 7. The method of claim 6, further including:transmitting at least one of the selected operating parameters from thesystem controller to a third local controller assembly associated with athird controllable component of the wheelchair in a third message via abus when the system controller is in the normal mode, the third localcontroller assembly including a third drive motor or actuator mechanism,a third local controller having circuitry to drive the third drive motoror actuator mechanism, and a third sensor sensing a condition associatedwith the third drive motor or actuator mechanism and in operativecommunication with the third local controller; and controlling the thirddrive motor or actuator mechanism via the third local controller inresponse to operating parameters received by the third local controllerassembly and in relation to the condition sensed by the third sensor;wherein the third local controller is disposed in a fourth housing at afourth location on the wheelchair.
 8. The method of claim 7, furtherincluding: transmitting at least one of the selected operatingparameters from the system controller to a fourth local controllerassembly associated with a fourth controllable component of thewheelchair in a fourth message via a bus when the system controller isin the normal mode, the fourth local controller assembly including afourth drive motor or actuator mechanism, a fourth local controllerhaving circuitry to drive the fourth drive motor or actuator mechanism,and a fourth sensor sensing a condition associated with the fourth drivemotor or actuator mechanism and in operative communication with thefourth local controller; and controlling the fourth drive motor oractuator mechanism via the fourth local controller in response tooperating parameters received by the fourth local controller assemblyand in relation to the condition sensed by the fourth sensor; whereinthe fourth local controller is disposed in a fifth housing at a fifthlocation on the wheelchair.
 9. The method of claim 5, wherein the normalmode is a powered driving mode and the first local controller assemblyis a first motor assembly.
 10. The method of claim 5, wherein the normalmode is a powered seating mode and the first local controller assemblyis a first actuator assembly.
 11. The method of claim 5, wherein thesupport mode is a programming mode and the first local controllerassembly is a first motor assembly.
 12. The method of claim 5, whereinthe support mode is a programming mode and the first local controllerassembly is a first actuator assembly.